linux-kernel - Re: [F.A.Q.] perf ABI backwards and forwards compatibility

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Message-ID: <1320748366.2244.15.camel@twins>
Date:	Tue, 08 Nov 2011 11:32:46 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Ted Ts'o <tytso@....edu>, Pekka Enberg <penberg@...helsinki.fi>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Vince Weaver <vince@...ter.net>,
	Pekka Enberg <penberg@...nel.org>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Avi Kivity <avi@...hat.com>,
	"kvm@...r.kernel.org list" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
	qemu-devel Developers <qemu-devel@...gnu.org>,
	Alexander Graf <agraf@...e.de>,
	Blue Swirl <blauwirbel@...il.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [F.A.Q.] perf ABI backwards and forwards compatibility

On Tue, 2011-11-08 at 11:22 +0100, Ingo Molnar wrote:
> 
> We do even more than that, the perf ABI is fully backwards *and* 
> forwards compatible: you can run older perf on newer ABIs and newer 
> perf on older ABIs. 

The ABI yes, the tool no, the tool very much relies on some newer ABI
parts. Supporting fallbacks isn't always possible/wanted.


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